CN103297324A - Method for local area network positioning in instantaneous network data transmission - Google Patents
Method for local area network positioning in instantaneous network data transmission Download PDFInfo
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Abstract
The invention relates to a method for local area network positioning in instantaneous network data transmission. The method includes the steps: a), connecting clients; b), recording client information, client IDs (identities), client intranet IPs (internet protocols) and ports and client public network IPs and ports by a server; c), acquiring related information of a target client; d) positioning and judging local area networks; e), if a source client and the target client are in the same local area network, performing direct data transmission; and f), if the source client and the target client are not in the same local area network, adopting an existing data transmission method. According to the method, a sender and a receiver in data transmission are judged whether in the same local area network or not, and then different transmission schemes are adopted according to judgment; if the sender and the receiver are in the same local area network, data is transmitted through the local area network without occupying bandwidth of a public network, so that network resources are saved; meanwhile, by the aid of bandwidth advantages inside the local area network, instantaneity of data transmission is guaranteed, and quality requirements of data transmission are met.
Description
Technical field
The present invention relates to the local area network locating method in a kind of network data instantaneous transmission, in particular, relate in particular to the local area network locating method in a kind of network data instantaneous transmission that can effectively save the public network broadband resource.
Background technology
Along with developing rapidly of Internet technology, the application of the instant transfer of data of network is extensive further.The typical application of the instant transfer of data of network mainly is MSNs such as similar MSN, QQ, and other P2P Internet video and transfer of data are downloaded in the software, also relate to the instantaneous transmission of network data.Need the network data of instantaneous transmission that number of different types are arranged, comprise text data, file data, stream medium data, the network data of these instantaneous transmission often needs higher transmission quality, and therefore network environment is supported preferably.
In the network environment based on IPv4, the IP address of public network is very rare at present.Extensive and effective solution is the NAT technology that adopts based on local area network (LAN) at present, and namely a kind of is the internal network of local area network (LAN) (abbreviation Intranet) private ip and port translation a kind of technology of external network (abbreviation public network) IP and port.Be positioned at that the multiple host of same local area network (LAN) can be connected to INTERNET by one or several public network IP after the NAT, this has alleviated the situation of IP address anxiety in the present IPv4 environment to a certain extent.
But be based on the route difficulty that local area network technology increases the instantaneous transmission of network data, the network bandwidth of various data consumes also has been with many inconvenience to the user under the network data transmission demand that increases day by day at present.Particularly at the instantaneous transmission of stream medium data, if there are not enough network bandwidths, be difficult to guarantee good stream media quality, influence stream medium data instantaneous transmission both sides' operating position.At the problems referred to above, many MSNs have adopted the transmission plan of P2P, but in the P2P transmission course, are positioned at that the multiple host of same local area network (LAN) carries out the instantaneous transmission of data if desired after the NAT, if do not carry out the judgement of local area network (LAN) location timely, then bring problems.At first, the transmission bandwidth in the local area network (LAN) is very sufficient, and the instantaneous transmission that utilizes local area network (LAN) inside to carry out transfer of data, particularly big data quantity can bring good laser propagation effect and quality.If do not carry out the local area network (LAN) location, then caused the waste of local area network (LAN) internal bandwidth.Secondly, opposite with bandwidth resources sufficient in the local area network (LAN), the bandwidth resources of public network are then very nervous, if there is not the local area network (LAN) location, then cause the interior data of same local area network (LAN) to send by the public-network bandwidth resource exit easily, the situation that returns to user in the local area network (LAN) again takes place, and this situation has taken the outlet bandwidth of local area network (LAN) and public network, consume the bandwidth of public network simultaneously, produced the waste of resource.
Therefore, on present network data instantaneous transmission problem, need take full advantage of the advantage of enough bandwidth resource in the local area network (LAN), not influence the promptness of transfer of data simultaneously, the situation of avoiding the interior data of local area network (LAN) to take the public network bandwidth resources produces.
Summary of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technical problem, and the local area network locating method in a kind of network data instantaneous transmission that can effectively save the public network broadband resource is provided.
Local area network locating method in the network data instantaneous transmission of the present invention, its special feature is, may further comprise the steps: a). client connects, and client is when bringing into operation, obtain its place local area network (LAN) Intranet IP and port, and be connected to by TCP in the secondary server of public network IP; B). the server record client-side information, each client of server record is carried out the necessary information of transfer of data, comprises public network IP and the port of client id, client place local area network (LAN) Intranet IP and port and client; C). obtain the relevant information of destination client, when arbitrary source client need be carried out instant transfer of data to the destination client, obtain the relevant information of destination client according to destination client ID from secondary server, relevant information comprises destination client local area network (LAN) Intranet IP and port, public network IP and port; D). the local area network (LAN) location determination, the source client judges whether source client and destination client are in the same local area network (LAN), if source client and destination client are in the same local area network (LAN) execution in step e according to the relevant information of obtaining); If source client and destination client are not in the same local area network (LAN), then execution in step f); E). carry out the immediate data transmission, direct Point-to-Point Data Transmission is carried out by lan address in source client and destination client, and does not take the broadband resource of public network; F). adopt the available data transmission method, source client and target customer carry out transfer of data by existing data transmission method by public network.
Local area network locating method in the network data instantaneous transmission of the present invention, the described local area network (LAN) location determination of step d) may further comprise the steps: d-1). and send request and start timer, the source client is obtained local area network (LAN) Intranet IP and port, public network IP and the port of destination client from the secondary server end, and to destination client local area network (LAN) Intranet IP transmission data transfer request message, start timer T simultaneously; D-2). be in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client receives the response message of destination client, judges that then source client and destination client are in the same local area network (LAN), and closes timer T; D-3). in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client does not receive the response message of destination client, then judges source client and destination client not in same local area network (LAN), and closes timer T; Steps d-2) and d-3) the triggered time t of timer T is according to the network environment setting in.Steps d-1) in, the source client is in same local area network (LAN) with the destination client with it serve as that the hypothesis prerequisite is carried out the request message transmission; If source, destination client are in the same local area network (LAN), then the client request message that sends in source is sent to the destination client, steps d-2) in can receive response message in the endogenous client of time t; If source, destination client are not in the same local area network (LAN), then the client request message that sends in source can not be sent to the destination client, then steps d-3) in can not receive response message in the endogenous client of time t.
Local area network locating method in the network data instantaneous transmission of the present invention, described steps d-2) the triggered time t of timer T is 1s and d-3).
Local area network locating method in the network data instantaneous transmission of the present invention, the described immediate data transmission method of step e) is: the source client is connected by UDP with the destination client, IP carries out instant transfer of data by the local area network (LAN) Intranet, and this moment, two clients were no longer carried out with secondary server alternately.
Local area network locating method in the network data instantaneous transmission of the present invention, the described available data transmission method of step f) is: be transmitted to the method for destination client again by the data of secondary server reception sources client, perhaps carry out transfer of data by the mode that local area network (LAN) NAT burrows.
The invention has the beneficial effects as follows: whether method of the present invention at first transmit leg and the reciever of judgment data transmission is in same local area network (LAN) inside, being equivalent to has increased a kind of local area network locating method between the process of network data instantaneous transmission at present, and takes different transmission plans respectively according to estimate of situation.If not at same local area network (LAN), then adopt original network data transmission scheme; If be in same local area network (LAN) inside, then Chuan Shu data are directly transmitted by local area network (LAN), and need not take the outlet bandwidth of public network again, and saved Internet resources, the superiority bandwidth of local area network (LAN) inside has also guaranteed instantaneity and the quality requirement of transfer of data simultaneously.
Description of drawings
Fig. 1 is the realization Organization Chart of the local area network locating method in the network data instantaneous transmission of the present invention;
Fig. 2 is the flow chart of local area network locating method of the present invention;
Fig. 3 is source client among the present invention and the destination client determination methods flow chart in same local area network (LAN) whether.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
The invention will be further described below in conjunction with accompanying drawing and embodiment.
The framework of present embodiment is divided into client and two parts of secondary server end, can realize the instant network transmission function of video data between the client.As shown in Figure 3, provided the realization Organization Chart of the local area network locating method in the network data instantaneous transmission of the present invention.Whether in same local area network (LAN), video data adopts different transmission plans to carry out instant network transmission according to source and destination client.
As shown in Figure 1 and Figure 2, provided the detail flowchart of the method for the invention, below in conjunction with these two flow charts the local area network locating method in the network data instantaneous transmission of the present invention has at length been described.
In the present embodiment, the secondary server end has public network IP, and each client can have public network IP, also can be in a certain local area network (LAN), has Intranet IP, and externally the NAT address mapping through local area network (LAN) is connected to public network.Present embodiment carries out following steps:
A). client connects, and client is obtained its place local area network (LAN) Intranet IP and port when bringing into operation, and is connected to by TCP in the secondary server of public network IP;
In the present embodiment, adopted the Intranet IP that obtains this machine place local area network (LAN) as minor function, this function at first needs to handle when arbitrary client brings into operation.Adopt the VC++ language to carry out the coding of the method for the invention.
CString ConnectDlg::GetHostIP()
{
char hostname[20];
gethostname(hostname,20);
//get ipv4 address.
hostent *pHost=::gethostbyname(hostname);
in_addr addr;
char *p=pHost-> h_addr_list[0];
memcpy(&addr.S_un.S_addr,p,pHost-> h_length);
CString v4IP=::inet_ntoa(addr);
return v4IP;
}
After obtaining Intranet IP, client just connects with server by TCP to be registered, and the process of registration is the process that self relevant information is sent to the secondary server end.It is as follows to encode:
void ConnectDlg::OnRegister()
{
CString myip;
char hostname[20];
char servicerip[20];
char mymainmac[50];
char cmyip[20];
this->GetDlgItemText(IDC_EDIT1,hostname,20);
//this->OnCancel();
((CVideoNetDlg*)mdlg)->dnovideo.Inputname(hostname);
((CVideoNetDlg*)mdlg)->dvideo.Inputname(hostname);
((CVideoNetDlg*)mdlg)->dnovideo.addgroupname(0,hostname);
((CVideoNetDlg*)mdlg)->dvideo.addgroupname(0,hostname);
this->GetDlgItemText(IDC_EDIT18,servicerip,20);
//this->OnCancel();
((CVideoNetDlg*)mdlg)->dnovideo.Inputserviceip(servicerip);
((CVideoNetDlg*)mdlg)->dvideo.Inputserviceip(servicerip);
myip=GetHostIP();
strncpy(cmyip,(LPCTSTR)myip,sizeof(cmyip));
((CVideoNetDlg*)mdlg)->dnovideo.Inputmyip(cmyip);
((CVideoNetDlg*)mdlg)->dvideo.Inputmyip(cmyip);
int getma=GetMAC(mymainmac);
((CVideoNetDlg*)mdlg)->dnovideo.Inputuserid(mymainmac);
((CVideoNetDlg*)mdlg)->dvideo.Inputuserid(mymainmac);
((CVideoNetDlg*)mdlg)->dnovideo.SendRregisterMessage(MESG_REGISTER,cmyip, hostname, mymainmac);
}
The information of registration comprises client id, client place Intranet IP, client NIC MAC Address, and adopts MAC Address as ID, to realize the purpose to the unique sign of client and index.Other information are as auxiliary required and use for other functions or expanded function.
B). the server record client-side information, each client of server record is carried out the necessary information of transfer of data, comprises public network IP and the port of client id, client place local area network (LAN) Intranet IP and port and client;
At the secondary server end, set up following data structure required information is stored.
struct Peer_Info
{
char UserMac[MAX_MACLEN];
char UserName[MAX_USERNAME];
unsigned int PublicAddr_c;
unsigned int PublicPort_c;
unsigned int PublicAddr_d;
unsigned int PublicPort_d;
char PrivateAddr[MAX_IPLEN];
char ActiveTime[50];
char Exte[40];
char ReqName[REQ_NUM][50];
struct Peer_Info *next;
Peer_Info();
}
Shown in above-mentioned code, the data structure of employing is the chain sheet form, and each node of chained list has all been stored corresponding information, stores the pointer of next node simultaneously for retrieval.The log-on message that the secondary server end whenever receives a client all is stored as corresponding content a node of this chained list.
C). obtain the relevant information of destination client, when arbitrary source client need be carried out instant transfer of data to the destination client, obtain the relevant information of destination client according to destination client ID from secondary server, relevant information comprises destination client local area network (LAN) Intranet IP and port, public network IP and port;
This step at first sends the request of obtaining information by the source client to secondary server, finishes by following code:
void ConnectDlg::OnConnect()
{
char hostname[20];
char ip[20];
this->GetDlgItemText(IDC_EDIT1,hostname,20);
this->OnCancel();
((CVideoNetDlg*)mdlg)->dnovideo.Inputname(hostname);
((CVideoNetDlg*)mdlg)->dvideo.Inputname(hostname);
((CVideoNetDlg*)mdlg)->dnovideo.addgroupname(0,hostname);
((CVideoNetDlg*)mdlg)->dvideo.addgroupname(0,hostname);
}
When secondary server receives when request, then the destination client ID that connects of the request that sends according to the source client carries out retrieval and inquisition, finds corresponding node in the chained list of server end record nodal information, and relevant information is fed back to the source client.
case MESG_REQUEST_SOURCE:
{
struct Group_Info groupinfo[MAX_GROUPINFO]={{""},{""},{""},{""},{""},{""},{""},{""}};
CString reqcstring="";
for(int i=0;i<MAX_GROUPINFO;i++)
{
strcpy(groupinfo[i].name,"");
}
time_t t = time(0);
char tmp[64];
strftime(tmp, sizeof(tmp), "%Y/%m/%d %X",localtime(&t) );
int n=data[1];
char hmac[50]="";
for(int i=0;i<n;i++)
{
hmac[i]=data[2+i];
}
Reqcstring=reqcstring+ " request resource type "+tmp+ " "+hmac+ " ";
int arraypos=n+2;
int count=data[arraypos++];
int len=0;
for(int i=0;i<count;i++)
{
len=data[arraypos++];
int j=0;
for(j=0;j<len;j++)
groupinfo[i].name[j]=data[arraypos+j];
arraypos=arraypos+len;
reqcstring=reqcstring+groupinfo[i].name;
if(i<count-1)
reqcstring=reqcstring+" ";
FindNode(groupinfo[i].name,hmac,port,address);
strcpy(groupinfo[i].name,"");
}
reqcstring=reqcstring+"\n";
ToArrayA(reqcstring);
return;
}
D). the local area network (LAN) location determination, the source client judges whether source client and destination client are in the same local area network (LAN), if source client and destination client are in the same local area network (LAN) execution in step e according to the relevant information of obtaining); If source client and destination client are not in the same local area network (LAN), then execution in step f);
This described local area network (LAN) location determination can realize by following steps:
D-1). send request and start timer, the source client is obtained local area network (LAN) Intranet IP and port, public network IP and the port of destination client from the secondary server end, and to destination client local area network (LAN) Intranet IP transmission data transfer request message, start timer T simultaneously;
D-2). be in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client receives the response message of destination client, judges that then source client and destination client are in the same local area network (LAN), and closes timer T;
D-3). in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client does not receive the response message of destination client, then judges source client and destination client not in same local area network (LAN), and closes timer T; Steps d-2) and d-3) the triggered time t of timer T is according to the network environment setting in.
Adopt following code to carry out this step:
int DSocket::contactnextcandidate(int groupn)
{
char data[1000];
int n,q,p;
if (groupinfo[groupn].candidateparent[0].publicport!=0)
{
data[0]=MESG_JOIN_TESTNAT;
data[1]=groupn;
n=strlen(groupinfo[groupn].candidateparent[0].almid);
data[2]=n;
memcpy(&data[3],groupinfo[groupn].candidateparent[0].almid,n);
SendTo(data,n+3,PORT_NOVIDEO,groupinfo[groupn].candidateparent[0].priip);
//timer
((CVideoNetDlg *)pdlg)->AddLaunchHoleQTimer(1000,groupn,1);
}
return 0;
}
Wherein can see, at the code that directly sends to Intranet IP data:
SendTo(data,n+3,PORT_NOVIDEO,groupinfo[groupn].candidateparent[0].priip);
The back has started ((CVideoNetDlg *) pdlg)-AddLaunchHoleQTimer (1000, groupn, 1); Such timer.
To represent the triggered time be 1000 milliseconds to parameter 1000 in the timer, just 1 second.Shown in the following code of the structure of timer:
void CVideoNetDlg::AddLaunchHoleQTimer(int interv, int groupn, UINT nIDEvent)
{
// data and address port are recorded to timer chain meter
timerdatasave.groupn=groupn;
SetTimer(nIDEvent,interv,NULL);
}
E). carry out the immediate data transmission, direct Point-to-Point Data Transmission is carried out by lan address in source client and destination client, and does not take the broadband resource of public network;
When the time does not arrive 1 second, when just receiving information, then timer T is closed, then by directly sending to the code of Intranet IP data
SendTo(data,n+3,PORT_NOVIDEO,groupinfo[groupn].candidateparent[0].priip);
Continuation sends data.The described immediate data transmission method of this step is: the source client is connected by UDP with the destination client, and IP carries out instant transfer of data by the local area network (LAN) Intranet, and this moment, two clients were no longer carried out with secondary server alternately.
F). adopt the available data transmission method, source client and target customer carry out transfer of data by existing data transmission method by public network.
In the present embodiment, if source client and destination client be not in same local area network (LAN), then can't carry out transfer of data by the method for direct transmission the other side IP, can receive the data transmission method that data are transmitted to the destination client again by secondary server, also can carry out transfer of data by the mode that local area network (LAN) NAT burrows.
The described method of the application of the invention, automatically recognition data transmission both sides in same local area network (LAN), the transfer of data both sides in same local area network (LAN) can use bandwidth in the local area network (LAN), and do not take common bandwidth.In the concrete experiment of present embodiment, if the both sides of transmission data are in the same local area network (LAN), the relatively large data (as the video data of Streaming Media) of transmission then no longer take the public network bandwidth, the public network bandwidth that the auxiliary log-on message transmission of client takies, can be ignored below 0.1% compared to video data.If the client of transmission data has half situation to be in same local area network (LAN) inside, take the public network bandwidth and can save nearly 50%.Therefore take full advantage of the advantage of enough bandwidth resource in the local area network (LAN), saved common network resource, the superiority bandwidth of local area network (LAN) inside has also guaranteed instantaneity and the quality requirement of transfer of data simultaneously.
Claims (5)
1. the local area network locating method in the network data instantaneous transmission is characterized in that, may further comprise the steps:
A). client connects, and client is obtained its place local area network (LAN) Intranet IP and port when bringing into operation, and is connected to by TCP in the secondary server of public network IP;
B). the server record client-side information, each client of server record is carried out the necessary information of transfer of data, comprises public network IP and the port of client id, client place local area network (LAN) Intranet IP and port and client;
C). obtain the relevant information of destination client, when arbitrary source client need be carried out instant transfer of data to the destination client, obtain the relevant information of destination client according to destination client ID from secondary server, relevant information comprises destination client local area network (LAN) Intranet IP and port, public network IP and port;
D). the local area network (LAN) location determination, the source client judges whether source client and destination client are in the same local area network (LAN), if source client and destination client are in the same local area network (LAN) execution in step e according to the relevant information of obtaining); If source client and destination client are not in the same local area network (LAN), then execution in step f);
E). carry out the immediate data transmission, direct Point-to-Point Data Transmission is carried out by lan address in source client and destination client, and does not take the broadband resource of public network;
F). adopt the available data transmission method, source client and target customer carry out transfer of data by existing data transmission method by public network.
2. the local area network locating method in the network data instantaneous transmission according to claim 1 is characterized in that, the described local area network (LAN) location determination of step d) may further comprise the steps:
D-1). send request and start timer, the source client is obtained local area network (LAN) Intranet IP and port, public network IP and the port of destination client from the secondary server end, and to destination client local area network (LAN) Intranet IP transmission data transfer request message, start timer T simultaneously;
D-2). be in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client receives the response message of destination client, judges that then source client and destination client are in the same local area network (LAN), and closes timer T;
D-3). in the judgement of same local area network (LAN), if in the triggered time of timer T t, the source client does not receive the response message of destination client, then judges source client and destination client not in same local area network (LAN), and closes timer T; Steps d-2) and d-3) the triggered time t of timer T is according to the network environment setting in.
3. the local area network locating method in the network data instantaneous transmission according to claim 2 is characterized in that: the triggered time t of timer T is 1s described steps d-2) and d-3).
4. the local area network locating method in the network data instantaneous transmission according to claim 1 and 2, it is characterized in that: the described immediate data transmission method of step e) is: the source client is connected by UDP with the destination client, IP carries out instant transfer of data by the local area network (LAN) Intranet, and this moment, two clients were no longer carried out with secondary server alternately.
5. the local area network locating method in the network data instantaneous transmission according to claim 1 and 2, it is characterized in that: the described available data transmission method of step f) is: be transmitted to the method for destination client again by the data of secondary server reception sources client, perhaps carry out transfer of data by the mode that local area network (LAN) NAT burrows.
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